2015 BMW 520 2.0L Diesel · DX15 LSU

A consistent five-year run of clean MOT passes with zero advisories or failures recorded at the 2025-09-26, 2024-10-19, 2023-10-19, 2022-09-30 and 2021-10-16 tests presents a notably tidy roadworthiness history for this 2015 BMW 520. The absence of any documented advisories means there is no recorded DVSA evidence of developing corrosion on subframes or brake lines, worn suspension components, brake disc lipping, oil leaks, or exhaust deterioration at any of the recent examinations. While a clean pass record does not constitute a guarantee of mechanical perfection, it does indicate that the vehicle has not, as of its most recent test, displayed any of the specific defects an examiner chose to highlight. This is a stronger documented baseline than many vehicles of comparable age and mileage. The recorded mileage of 139,765 miles against an eleven-year vehicle age equates to approximately 12,706 miles per year, which is a high annual accumulation for a 5 Series of this generation. The MOT history shows regular annual testing without any extended gaps between examinations, suggesting the car has been in consistent use rather than laid up for long periods, which is generally favourable for preserving drivetrain and underbody condition by avoiding prolonged stationary corrosion. However, the high cumulative mileage means that major service items typically due on these vehicles by this point are well overdue or will be imminent, including timing chain components, VANOS solenoid seals, valve cover gaskets, and the secondary air system on the N20 engine. The 5 Series automatic gearbox (if fitted, the ZF 8HP) also typically requires an oil and filter change at this mileage bracket to maintain shift quality. Given the lack of recorded advisories, the test drive should focus on the wear items that high-mileage F10/F11 generation BMWs commonly exhibit but which do not necessarily trigger a test advisory. Listen for any clonks or knocking from the front suspension over speed humps and uneven surfaces, which would suggest worn control arm bushes, top mounts, or wishbone bushings. Check for steering wander, vibration through the wheel between 60 and 80 mph, or any pulling under braking, all of which may indicate warped front brake discs or worn lower suspension linkages. Inspect the front brake discs visually for a pronounced lip at the outer edge, as a 139,000-mile vehicle is well past the point where discs may be approaching the minimum thickness or showing heat checking. Verify that the steering responds without delay and that there is no excessive play at the straight-ahead position. On a mechanical inspection, pay particular attention to signs of oil leakage from the engine and from the automatic transmission sump, as high-mileage N20 and N47 engines commonly seep from the valve cover gasket, oil filter housing, and from the front crankshaft seal. Start the engine from cold if possible and observe the exhaust for blue smoke on initial start-up, which would indicate valve guide or piston ring wear, or excessive white smoke that clears after warming, which suggests minor head gasket or coolant system sealing issues. Check the underside of the engine bay and beneath the car for any fresh oil staining or coolant residue, and confirm that the cooling system has been maintained with fresh coolant to prevent water pump and thermostat failures common on these engines. Finally, confirm a full documented service history including the timing chain replacement interval, as a skipped timing chain service on the N20 at this mileage is a known cause of catastrophic engine failure and is the single most significant mechanical risk on any high-mileage BMW 5 Series of this generation.